Nemo auditur propriam turpitudinem allegans - "No one can be heard, who invokes his own guilt." Nobody can bring a case that stems from their own illegal act.⏎
Nemo judex in sua causa - "No one shall be a judge in his own case." Prevents conflict of interest in courts. Often invoked when there is really no conflict, but when there is even the appearance of one.⏎
Nemo ius ignoratur censetur - "Not knowing the law is harmful." Everyone should know the law. This is used in European Law-countries with a history of Roman law, the 'sentence' was first made by Aristotle.⏎
Lex specialis derogat legi generali - "A law governing a specific subject matter overrides a law which only governs general matters."⏎
Lex posterior derogat priori - "Later law removes the earlier." More recent law overrules older ones on the same matter.⏎